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8.18.3.1 Positive Response Message Definition - $Level $80 (readStatusOfDTCByDTCNumber)
(Table 177).
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GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
Table 177: ReadDiagnosticInformation(readStatusOfDTCByDTCNumber) UUDT Positive Response
Message
Data Byte Parameter Name
Cvt Hex Value Mnemonic
#1
MessageNumber = [ readStatusOfDTCByDTCNumber ]
M
80
RSDTCBN
#2
#3
#4
#5
DTCFailureTypeStatusRecord= [
DTCHighByte
DTCLowByte
DTCFailureTypeByte
DTCStatusByte ]
M
xx
xx
xx
xx
DTCFTSR_
DTCH
DTCL
DTCFT
DTCST
Note: 
There are no subsequent UUDT responses associated with $Level $80 of mode $A9.
8.18.3.2 Positive Response Message Definition - $Level $81 (readStatusOfDTCByStatusMask). 
The
following UUDT response to the $A9 $Level $81 request is sent for each DTC that satisfies the tester defined
masking criteria. See Table 178.
Table 178: ReadDiagnosticInformation(readStatusOfDTCByStatusMask) UUDT Response Message
Data Byte Parameter Name
Cvt Hex Value Mnemonic
#1
MessageNumber = [ readStatusOfDTCByStatusMask ]
M
81
RSDTCBS
#2
#3
#4
#5
DTCFailureTypeStatusRecord= [
DTCHighByte
DTCLowByte
DTCFailureTypeByte
DTCStatusByte ]
M
xx
xx
xx
xx
DTCFTSR_
DTCH
DTCL
DTCFT
DTCSB
The following UUDT endOfDTCReport message shall be sent after all ($81) UUDT messages containing DTC
information have been returned to the tester. If no ($81) UUDT messages containing DTC information are sent
(because the ECU determined that no DTCs matched the tester-specified masking criteria), the
endOfDTCReport message shall still be sent.